WatchGuard Fireware OS up to 12.11.7/2026.1.1 Web UI cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability has been found in WatchGuard Fireware OS up to 12.11.7/2026.1.1 and classified as problematic. Affected by this issue is some unknown functionality of the component Web UI. This manipulation causes cross site scripting. This vulnerability is tracked as CVE-2026-3343. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in WatchGuard Fireware OS up to 12.11.7/2026.1.1 and classified as problematic. Affected by this vulnerability is an unknown part of the component Web UI. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

A reflected cross-site scripting (XSS) vulnerability in the Fireware OS Web UI enabled execution of malicious JavaScript in the context of an authenticated management user's browser when they click on a specially crafted link. This vulnerability affects Fireware OS 12.7 up to and including 12.11.7 and 2025.1 up to and including 2026.1.1.

The weakness was disclosed by btaol as wgsa-2026-0004. It is possible to read the advisory at watchguard.com. This vulnerability is known as CVE-2026-3343 since 02/27/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/27/2026 CVE reserved
03/03/2026 +4 days Advisory disclosed
03/03/2026 +0 days VulDB entry created
03/06/2026 +3 days VulDB entry last update

Sourcesinfo

Advisory: wgsa-2026-0004
Researcher: btaol
Status: Confirmed

CVE: CVE-2026-3343 (🔒)
GCVE (CVE): GCVE-0-2026-3343
GCVE (VulDB): GCVE-100-348547

Entryinfo

Created: 03/03/2026 14:58
Updated: 03/06/2026 12:03
Changes: 03/03/2026 14:58 (67), 03/04/2026 21:26 (11), 03/06/2026 12:03 (1)
Complete: 🔍
Cache ID: 216::103

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